The boundary between these two was the region surrounding the cities of Gurgan and Damghan.
His army took Nishapur, where Nasr had sought refuge, defeated a 10,000-strong Ummayad force at Gurgan in August and subsequently took Rayy.
Jajarm, Damghan, Simnan, and Gurgan were then occupied, and Togha Temur and his personal following fled to Mazandaran.